Process of making a substitute for wool from viscose



Patented June 8, 1937. I v

UNITED STATES PATENT OFFICE PROCESS OF MAKING A SUBSTITUTE FOR WOOL FROMVISCOSE Walther Zetzsche and Hermann Faber, Premnitz, Germany, assignorsto I. G. Farbenindustrie Aktiengesellschaft, Frankfort on the Main.Germany No Drawing. Application November 29, 1935, Serial No. 52,201. InGermany November 30,

Claims. (01. 18-54) Our present invention relates to the manufacare atthe same time desulfurized, so that septure of a substitute for W001from viscose. arate desulfurizing is not necessary in this case. One ofits objects is a process of making an The following is an example of theinvention: improved substitute for W001 from viscose. An- Viscose isspun from a nozzle having 800 per- 5 other object is a process of makingwell crimped forations at 25 C. in a solution of ammonium staple fiberfrom viscose. Further objects'will sulfate of 30 per cent. strength; allthe fiber be seen from the detailed specification following bundles thusproduced are united in a spinning hereafter. machine to form thickbundles ofseveral 1000 According to the invention well crimpedceldeniers. These bundles are now out to staples lulose artificialfibers are obtained by cutting ce'land introduced into glycerin heatedto 120 C. 10 lulose xanthate into staple threads and treating From theheated glycerin the crimped fibers are these with heated'liquids toconvert them into separated by means of conveyer sieves runningcellulose threads. It is preferable to stretch the over rollers or byany other known device. It xanthate threads in the coagulation bath orbeis then freed, by washing with water, from the tween the coagulationbath and the cutting maadhering glycerin and treated with solutions of15 chine. Any known device may be used for the scaping agents orbrightening agents. The fibers stretching, for example rollers driven atdifierthus made are dried and combed to produce a ent speeds, or rodsset in staggered relationship loose staple fiber sliver. The thread isthoroughin the path of the thread and thus cause the ly crimped, inwhich respect it approximates wool latter to change its direction. Alsothe stretchvery closely. 20

ing may be produced by use of a draft speed ex- Instead of the glycerinheated at 120 C. a ceeding considerably the speed of expression of,'concentrated solution of sodium sulfate boiling at the xanthate.Spinning baths suitable for makabout 103 C. may be used. Thedecomposition ing the cellulose xanthate threadsare ammonium needs alittle more time in view of the lower temsulfate solutions, with orwithout sodium sulfate. perature. 25

As decomposing liquids glycerin, glycol, sulfo- What we claim is: nated:oii, such as sulfonated olive oil or castor 1. A p ocess of making aubsti ute for W001 oil are suitable. There may also be used aqueouswhich comprises squirting viscose into a precipisolutions of highboiling point of inorganic salts, tating bath capable of precipitatingthe viscose such as a calcium chloride solution, or a conin the form ofcellulose xanthogenate, assembling 30 centrated solution of sodiumsulfate which has the spun th a s to a h k fi r b cutting proved to bewell adapted, aqueous solutions of the fiber band into staples, andconverting the organic acids, such as oxalic acid, alcohols of cellulosexanthogenate into cellulose hydrate by high boiling point, ethers of thehydroaromatic, means of a liquid heated at 60 to 50 C.

aromatic and aliphatic series, ketones of high 2- A Process f m kin asubstitute for wool 35 boiling point, such as cyclohexanone and theirwhich comprises squirting viscose into a'precipisubstitution products.The decomposition of the tating bath capable of precipitating theviscose xanthate threads in a decomposing bath occuin the form ofcellulose xanthogenate, assembling pies a few seconds up to a fewminutes in ac the spun threads to a thick fiber band, cutting 40cordance with the temperature selected. The the fiber band into staples,nd converting the 40 temperature mayvary between about and 150 cellulosexanthogenate into cellulose hydrate by C., and is preferably to C. It isalso means of a liquid heated at 120 to 130 C. possible to decompose thethreads at a temper 3. A process of making a substitute for W001 aturelower than 60, however, the treatment lasts which comprises squirtingviscose into a precipi- 45 too long for practical purposes. After thede-- tating bath capable of precipitating the viscose 45 composition thethreads are separated from the in the form of cellulose xanthogenate,assembling decomposition liquid and freed by washing with the spunthreads to'a; thick fiber band, cutting water from the adheringchemicals, particularly the fiber band into staples, and converting thethe adhering decomposition liquid. From the cellulose xanthogenate 'intocellulose hydrate by washing liquid the substance used for decomposmeansof a liquid having a desulfurizing action 50 ing the xanthate may berecovered by evaporaheated at 60 to C. tion. 4. A process of making asubstitute for wool If glycerin, glycol, sulfonated oil, as well aswhich comprises squirting viscose into a precipiorganic liquids whichdissolve sulfur are used tating bath capable of precipitating theviscose 5 for decomposing the xanthate fibers, the fibers in the form ofcellulose xanthogenate, assembling 5 the spun threads to a thick fiberband, cutting the fiber band into staples, and converting thecellulosexanthogenate into cellulose hydrate by means of glycerineheated at 120 C.

5. A process of making a substitute for wool which comprises Squirtingviscose into a precipitating bath capable of precipitating the viscosein the form of cellulose xanthogenate, as-

sembling the spun threads to a; thick fiber band, cutting the fiber bandinto staples, and converting the cellulose xanthogenate into cellulosehydrate by means of a boiling salt solution.

WALTHER ZETZSCHE. HERMANN' FABER.

